Limb assembly for sport bow

ABSTRACT

A limb assembly for a sport bow includes two limb pockets connected to two rises of the bow and each limb pockets includes two slots with a separation plate connected between the two slots. Each slot includes an open space. Two limb units each have the first end thereof inserted into the slots from the open space of each of the two limb pockets. A string IS connected between two respective second ends of the two limb units. Two resilient members are respectively located between the body and each of the two limb units. Each resilient member has a buffering portion protruding therefrom which is received in a recess of the rise corresponding thereto so that each limb unit resiliently compresses the rise by the resilient members. The resilient members are replaceable to adjust the compress force between the limb units and the rises.

BACKGROUND OF THE INVENTION 1. Fields of the Invention

The present invention relates to a limb assembly, and more particularly,to a limb assembly of a sport bow and the limb assembly allows the usersto easily change suitable limbs.

2. Descriptions of Related Art

The conventional sport bow generally includes a body having a griplocated at the central portion thereof, and with two rises extend fromtwo ends of the body. Each raise is connected with a limb which isconnected with a cam, and a string is connected between the two cams. Auser draws the string to store energy which is used to shoot the arrowwhen releasing the string. However, the draw weight is different ofdifferent sport bows, and some users may not able to draw the string toa full draw due to the draw weight is not suitable for the users.Therefore, the users should use a specific sport bow that is suitablefor the user to operate. Nevertheless, not every user can own his or hersport bow, in order to obtain a proper sport bow, the limbs need to bereplaced.

The replacement of the limbs requires a lot of time and needs specifictools for a skilled person, and this job cannot be easily done by ageneral user. Therefore, a replaceable limb assembly is developed toimprove the problem mentioned above.

The present invention is intended to provide a limb assembly that iseasily installed to the sport bow to meet different users' needs.

SUMMARY OF THE INVENTION

The present invention relates to a limb assembly for a sport bow, andcomprises a body having two raise on two ends thereof and each rise hasa recess. Two limb pockets are connected to the two rises and each havetwo slots with a separation plate connected therebetween. Each of theslots includes an open space. Two limb units each have the first endthereof inserted into the slots from the open space of each of the twolimb pockets. A string is connected between two respective second endsof the two limb units. Two resilient members are respectively locatedbetween the body and each of the two limb units. Each resilient memberhas a buffering portion protruding therefrom which is received in therecess of the rise corresponding thereto. Each of the limb unitsresiliently compress the rise corresponding thereto by the resilientmembers.

Preferably, each of the rises includes a connection portion and twopivotal members. The two pivotal members are located on two sides of theconnection portion. The connection portion includes two first recessedportions respectively defined in the two sides thereof. Each pivotalmember has a second recessed portion that faces the first recessedportion. An axle extends through the two pivotal members and theconnection portion. Two bolts are respectively threadedly connected totwo ends of the axle. Each bolt contacts against the outside face of thepivotal member corresponding thereto to secure the two pivotal membersto the connection portion.

Preferably, the open space of each slot includes a long opening and ashort opening. The long opening faces the rise, and the short opening islocated at one end of the slot.

Preferably, each of the limb units includes two sub-limbs which arerespectively inserted into the slots via the two short openings.

Preferably, the buffering portion of each resilient member has a holedefined therethrough so as to provide flexibility to the bufferingportion.

Preferably, the elastic coefficient of each of the resilient members 7is larger than or equal to 100 GPa.

Preferably, each of the resilient members 7 is made of rubber, lowdensity polyethylene, polypropylene, polyethylene terephthalate,polystyrene, nylon, oak or carbon fiber reinforcement plastic.

The advantages of the present invention are that the users may changethe resilient members to adjust the force that the limb units compressthe rises, without changing the limbs, to obtain a suitable drawingforce.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawingswhich show, for purposes of illustration only, a preferred embodiment inaccordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view to show the sport bow with the limbassemblies of the present invention;

FIG. 2 is an enlarged view to show the assembly of the rise, the limbpocket and the resilient members of the limb assemblies of the presentinvention;

FIG. 3 is an exploded view of the disclosure in FIG. 3;

FIG. 4 is an cross sectional view, taken along line IV-IV of FIG. 2;

FIG. 5 shows the limb compresses the resilient members when drawing thestring, and

FIG. 6 shows the operation of the resilient member made of differentmaterial.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1 to 6, the limb assembly for a sport bow of thepresent invention comprises a body 1 having two raise 10 connected twoends thereof. Two limb pockets 2 are respectively connected to the tworises 1 and each limb unit 4 has two slots 21 defined therein. Aseparation plate 23 is connected between the two slots 21 of each of thetwo limb pockets 2. Each of the slots 21 includes an open space 22,wherein the open space 22 includes a long opening 221 and a shortopening 222. The long opening 221 faces the rise 10, and the shortopening 222 is located at an end of the slot 21 and communicates withthe long opening 221. A bolt 3 extends through the separation plate 23and connects each of the two limb pockets 2 to the body 1. Each of therises 10 includes a connection portion 12 and two pivotal members 13.The two pivotal members 13 are located on two sides of the connectionportion 12. The connection portion 12 includes two first recessedportions 121 respectively defined in the two sides thereof. Each pivotalmember 13 has a second recessed portion 131 that faces the firstrecessed portion 121, and a recess 11 that is located opposite to thesecond recessed portion 131 as shown in FIG. 3. An axle 5 extendsthrough the two pivotal members 13 and the connection portion 12, andtwo bolts 8 are respectively threadedly connected to two ends of theaxle 5. Each bolt 8 contacts against the outside face of the pivotalmember 13 corresponding thereto to secure the two pivotal members 13 tothe connection portion 12.

Two limb units 4 each have the first end thereof inserted into the slots21 from the open space 22 of each of the two limb pockets 2. A string 6is connected between two cams that are respectively connected to thesecond ends of the two limb units 4. Specifically, each of the limbunits 4 includes two sub-limbs 41 which are respectively inserted intothe slots 21 via the two short openings 222.

Two resilient members 7 are respectively located between the body 1 andeach of the two limb units 4. Each resilient member 7 has a bufferingportion 71 protruding therefrom. The buffering portion 71 of eachresilient member 7 is received in the recess 11 of the pivotal member 13corresponding thereto. Each of the limb units 4 resiliently compressesthe rise 10 corresponding thereto by the resilient members 7. Thebuffering portion 71 of each resilient member 7 has a hole 72 definedtherethrough so as to provide flexibility to the buffering portion 71.The elastic coefficient of each of the resilient members 7 is largerthan or equal to 100 GPa. Each of the resilient members 7 is made ofrubber, low density polyethylene, polypropylene, polyethyleneterephthalate, polystyrene, nylon, oak or carbon fiber reinforcementplastic.

As shown in FIGS. 4 to 6, when the user draws the string 6, the limbunits 4 compress the resilient members 7. If a user cannot draw thestring 6 to a full draw, this means the limb units 4 are too stiff forthe user, the user then can change the resilient members 7 that havehigher elastic coefficient. The resilient members 7 also prevent thelimb units 4 to hit the limb pockets 2 when the limb units 4 bounceback.

Furthermore, the hole 72 in each buffering portion 71 provides properflexibility to the buffering portion 71 such that the noise caused bythe string 6 and the deformation of the limb units 4 can be reduced.

The replacement of the resilient members 7 are easy, and the whole limbunits 4 and the limb pockets 2 do not need to be dis-assembled. Bychoosing correct resilient members 7, the sport bow can be used bydifferent users.

While we have shown and described the embodiment in accordance with thepresent invention, it should be clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

1. A limb assembly for a sport bow, comprising: a body having two riseson two ends thereof, each of the two rises having a recess; two limbpockets connected to the two rises and each having two slots definedtherein, a separation plate connected between the two slots of each ofthe two limb pockets, each of the slots including an open space, a boltextending through the separation plate and connecting each of the twolimb pockets to the body; two limb units each having a first end thereofinserted into the slots from the open space of each of the two limbpockets, a string connected between two respective second ends of thetwo limb units, and two resilient members respectively located betweenthe body and each of the two limb units, each resilient member having abuffering portion protruding therefrom which is received in the recessof the rise corresponding thereto, each of the limb units resilientlycompressing the rise corresponding thereto by the resilient members. 2.The limb assembly as claimed in claim 1, wherein each of the risesincludes a connection portion and two pivotal members, the two pivotalmembers are located on two sides of the connection portion, theconnection portion includes two first recessed portions respectivelydefined in the two sides thereof, each pivotal member has a secondrecessed portion that faces the first recessed portion, each pivotalmember having the recess of the rise and the recess located opposite tothe second recessed portion, the buffering portion of each resilientmember received in the recess of the pivotal member correspondingthereto, an axle extends through the two pivotal members and theconnection portion, two bolts respectively threadedly connected to twoends of the axle, each bolt contacts against an outside face of thepivotal member corresponding thereto to secure the two pivotal membersto the connection portion.
 3. The limb assembly as claimed in claim 2,wherein the open space of each slot includes a long opening and a shortopening, the long opening faces the rise, the short opening is locatedat an end of the slot.
 4. The limb assembly as claimed in claim 3,wherein each of the limb units includes two sub-limbs which arerespectively inserted into the slots via the two short openings.
 5. Thelimb assembly as claimed in claim 4, wherein the buffering portion ofeach resilient member has a hole defined therethrough so as to provideflexibility to the buffering portion.
 6. The limb assembly as claimed inclaim 5, wherein an elastic coefficient of each of the resilient membersis larger than or equal to 100 GPa.
 7. The limb assembly as claimed inclaim 6, wherein each of the resilient members is made of rubber, lowdensity polyethylene, polypropylene, polyethylene terephthalate,polystyrene, nylon, oak or carbon fiber reinforcement plastic.